There is significant damage to a major roundabout after a BMW drove through the barriers and ended up in the embankment below.
Police, ambulance and the fire service rushed to Brighton Hill roundabout late on Wednesday night after a BMW left the road and plunged into the centre of the roundabout, taking out a concrete wall and railings.
The drop from the main roundabout to the embankment, which contains pedestrian underpasses, is roughly ten feet.
Police have confirmed that the driver of the vehicle has suffered a serious back injury, whilst the fire service said two more people were treated for injuries.
A spokesperson said that only one vehicle was involved.
The crash happened just before midnight on Wednesday, July 7, whilst the roads were quiet just an hour after England beat Denmark to make it to the Euro 2020 final.
Officers from Hampshire Constabulary are investigating the circumstances surrounding the crash.
A spokesperson said: "We were called at 11.53pm on Wednesday 7 July to a report of a single vehicle collision at the [Brighton Hill] roundabout.
"Officers attended and one person, the driver of the vehicle, suffered a serious back injury.
"Enquiries are ongoing into the exact circumstances of the collision."
A spokesperson for Hampshire and Isle of Wight Fire and Rescue Service said: "Two fire engines from Basingstoke attended Brighton Hill roundabout, Brighton Way, Basingstoke.
"One car off road and down an embankment. Three casualties in care of SCAS when we got there.
"Firefighters used absorbent pads to make the scene safe. Incident handed over to the police."
Significant debris still remains at the scene, with part of the raised kerb damaged and parts of the car's bodywork scattered around the path.
The railings on the side of the path have been damaged, whilst concrete blocks to one side of the underpass have fallen over.
Pieces of BMW M Performance bodywork could also be seen on the verge.
Hampshire County Council have been contacted for information regarding the repair work to the roundabout.
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